Valve-seat reamer



sept. 6,1927. 1,641,868 A. C. SAVIDGE VALVE SEAT REAMER Filed NOV. P2,1920 Patented'Sept 6, 19,27.

I 'UNITI-:D STATES l y Y 1,641,868 PATENT OFFICF'Ee A ALBERT o.sAvrnGrrz,` oF INnrANAPoLrs, rimrarm.l i

.vamravfsnamf`y BEAMER. Y

vAmin@mimi ineaA November 22.1920. 'serial' No. 4.0.5521." Y

' 'It is the object of my invention to produce f a simple and veffectivevalve-seat reamer,

which will be positive in its action. will oper- V ate: withoutchattering, will tend to feed`itvided for` association with each otherin any desired combination as conditions require m and for operation bythe same operating member. y

The accompanying drawing illustrates my invention:v Fig. 1 yis anelevation of avalveseatreamer embodying my invention in its preferredform. indicatingindottedelines a fragment of an vengine in which a valveseat A' is being reamed; Fig. 2v is a'transverse sec- -tion von-thelines v2,--2-2`of Figs. 1 and 4; Fig.

3 is a section ontheline 3 3 of F 2; Fig. V4is a section ontheline 4 4of Fig.' 2 and 4Fig.l 5 is a section. similarto Fig. 4, but show- Y,inga modified construction in which the Y stem is not interchangeable. y fl f The valve-seat reamer consistsy of an lopersa ating shaft. 10, acircular.k cutter head'll,l and a guide stem 12. In the' preferredformlofY my invention, these are all three. separabley from oneanother, the.lowerk end of the oper- .e

' ating shaftlObeing provided with afcentrali0 threaded hole 13 intowhich` the'thr'eaded upperend 14 of vthe g'uide ste1n-12 may be i"screwed toclamp the cutterhead llbetween the lower end ofthe "operatingshaftflOr andv :af'collar 15 `on the guide stem 12,near;its L5^upperend, as is clear from .Fig.'4. `When the three parts 10, 11and2are-together,- the device maybe operatedto ream out a valve y i'yseat-.byfbeing turned by -a cross barvflwhich... passes transverselythrough the vupperend of v` the operating shaftlO and which may be slidintok and out `of place. @The force'of.l

` turning .isi transmitted fromithe shaft and stem, 12 vto thecutterhead 11by a pin 17 g Hprovided on the cutter head V11 andfprojecte 55.ing-into a; notch 18 inf-the collar 15 inthe same mannenas thejpin17projects intothe` notch 18"*in" the construction shown in Fig.5. i n

*"By construction. the :reaction .against the' cutter head 11 when vtheshaft 10 v is turned merely clamps the threeparts 10,` 11, and 12 moretightly together; and in order to facilitate disconnection when desiredthe collar 15 is provided wit-h a'transverse opening through it forremovably receiving a cross pin 19 sol that by the operation of the twocross pinsr 16 and 19 the parts may be junscrewed without anyadditionaltools no matter how tightly clamped together. Y

With this construction, a number of cutter heads 11 and of guide stems12k may be provided in a kit, the `cutter heads being of differentdiameters and different tapers and the lstems 11 being offdifferentdiameters tomeet the usual lconditions which are encountered inlpractice.` Ordinarily, three stems and five or siX cuttersfwil takecare'of all the usual valve 'structures rcommonly Aniet with. All thecutter heads liavetheir'central holes 2O of the same size, andall theVguide stemsV have their 'upper ends 14 and collars 15 similar, `topermit universal interchangeability among'the parts.

lVhere 'this interchangeability ist'not dey sired, or even'vvhereinterchangeability of stems is not'desired, as v for instance when atingsl1aft10 andguide stem 12 are made integral,l andthe cutterjheadfll isput on ythe stem 12 with Aa tight fit; in which case the upper face ofthe cutter head is' provided with a projecting pin 17 for projectingintoa notch'18 in the shoulder formedat the lower `end kof the operatingvshaft 10,` wherev such. shaft joins thejguide stem12l the tool fis tobe used 'wholly on one 'size of work. such as lFord engines, thestructure: shown in Fig. 5y may be used, where theopjerein The cutterhead l1 or 11 preferablyvhas Vflat upper andv lower surfaces andy atapered periphery :between such surfaces. This tapered A'periphery mayextend to such upper fand lower `surfaces as shownin Figs, 1, 3,

and 4, or may stop short offone or bot-hief:`

themV with a cylindrical. surface betwee'nffas` Aindicated inF-ig. 5."The cut-ter head 'is pro- .vided withy a tool-receiving slot 21,'fforreceiving ya cutting tool 22,.` This slot 21 eX-V Y facenearly tothelowe'r face, as is cleark from 3. and at Yone end opens tothevtapered periphery-of thecutter head, and the cutting Vedge 23 of thecutting'tool 22 is shaped to tends into the vvcutter'head-y from theupper correspond to .thetaperuofthe periphery of l the cutter head andto the taper of the valve seat. The cutting tool 22 has an inclined rearend 24, which cooperates with the head of au adjusting screw mounted inthe cutter head at the rear end of the slot 21 so that by screwing downsuch screw 25 the cutting tool 2Q may be fed forward along the slot 21,as is crear from Fig. 3. The screw also resists any tendency which mayarise in use to force the cutting tool back ward along the slot 2l bythe reaction due to the reaming operation. The cutter 22 projects upwardslightly beyond the upper face of the cutter head, so that it will beacted on by a clamping plate 26 which passes obliquely over it, whichclamping plate 26 at its ends is provided with clamping screws 237mounted in the cutter head ll for clamping the clamping plate 26 tightlydown against the cutting too 22 to hold the latter in any position inwhich it may be adjusted by the adjusting screw Q5.

The slot 21 and the cutting tool 22 are in a plane parallel to andotiset 'from the axis of the operating shaft l() and guide stem 1Q, sothat the tool 2&2 is not radial in the cutter head but is at aconsiderable oblique angle to the cutter-head radius through the cuttingedge, with the rear or inner end of the slot 2l and tool 22 ahead ofthat radius in the direction of rotation, as clear from Fig. Q. As aresult., because of the taper of the outer surface of the cutter head,the lower end of the cutting edge 23 is farther angularly advancedcircumferentially in the direction of rotation than is the upper end ofAsaid cutting edge. This gives an undercutting action, tending to drawthe cutter head downward into the valve seat which is being reamed, thusat the same time both preventing chattering and relieving the operatorof the necessityY of exerting greatendwise pressure on the operatingshaft l0; for

i because the lower end of the cutting edge is advanced angularlyfarther than the upper edge of said edge the reaction on the cuttingedge tends to force the cutter downward into the work. This greatlyincreases the ease of operation of the tool and gives a smoother surfaceon the valve seat.

In operation, the proper valve stem 12 and proper cutter head ll arechosen for the valve seat to be reamed, if these parts areinterchangeable, and the tool assembled as shown in Fig. itu Then theassembled tool, whether of the type shown in Fig. 4i or of the typeyshown in Fig. 5, is placed in proper cooperation withV the valve seat 30to be reamed, with the guide stem l2 projecting into the hole 3l whichnormally receives the stem of the valve associated with such valve seat.Then, the cross bar 16 being in place, the Whole device is rotated byhand, or by any suitable driving mechanism attached to the square upperend 32 of the operating shaft 10, to cause the cutting edge Q3 to travelaround the valve seat and redress the valve-seat surface. The depth ofcut, or the thickness of material removed at one passage of the cuttingtool, is determined by adjusting the screw 25; and is limited by theprojection of the cutting tool beyond the circle of the head 1l or l1',by the engage ment of such head near such tool with the valve seat. Asthe operation is exceedingly simple and as chattering is avoided and itnot necessary to exert great endwise pres sure onto the tool to feed itinto the work, the redressing of the valve seat may be done with greatrapidity; and because of the smoothness of the cutting obtained byreason of the absence of chattering very little grindingin of the valvein the valve seat is necessary after the surface has been redressed withthe reanier.

I claim as my invention:

l. A valve-seat reamer, comprising an op erating member, a guide stemremovably attached thereto, `and a cutter head removably attached infixed axial position to said operating` member and guide stem, saidcutter head having a noircutting portion adapted to bear against thevalve-seat and limit the depth of the cut.

2. A valve-seat reamer, comprising an opf erat-ing shaft, a guide stemalined with said shaft and attachable thereto and detachable therefrom,and a cutter head removably mounted in fixed axial position on saidshaft and stem at the joint between them, said cutter head having anon-cutting portion adapted to bear against the valve-seat and limit thedepth of the cut.

3. A valve-seat reamer, comprising an operating shaft, a guide stemalined with said shaft and attachable thereto and' detachable therefrom,and a cutter head removably mounted in fixed axial position on saidshaft and stem, said cutter head having a noncutting portion adapted tobear against the valve-seat and limit the depth of the out.

Il. A valve-seat reamer, comprising an operating shaft, a guide stemaimed with and having a screw connection with the end of said operatingshaft, and a cutter head removably clampable in fixed axial positionbetween said shaft and stem by said screw connection, said cutter headhaving a noncutting portion adapted to bear against the valve-seat andlimit the depth of the out. i

5. A valve-seat reamer, comprising a tapered cutter head, means forrotating said cutter head, said cutter head being provided with a slotopening on the periphery and on the larger end face thereof, a cuttingtool mounted in said slot, an adjusting A screw mounted in said cutterhead and cooperating with said tool to feed the latter outward and takeany inward thrust therefrom, and a clamping bar extending across saidslot ico opening on the larger end face of said slot for clamping thecutting t-ool in said slot.

6. A valve-seat reamer, 'comprising a tapered cutter head, means forrotating said cutter head, said cutter head being provided with a slotopening on the periphery thereof, a cutting tool mounted in said slot,and an adjustingscrew mounted in said cutter head and cooperating withvsaid tool to feed the latter outward and take any inward thrusttherefrom. n'

7. A valve-seat reamer, comprising a tapered cutter head, means forrotating said cutter head, said cutter head being provided witha slotopening onthe vperiphery thereof, a cutting tool mounted in said slot,and an adjusting screw mounted in said cutter head and cooperating'withsaid tool to vfeed the latter outward and take any inward thrustvtherefrom, said screw being transverse to the said tool, and said toolhaving a surface which is engaged by the screw head and is oblique tothe screw axis.

8. A valve-seat reamer, comprising a tapered cutter head, means forrotating said cutter head, said cutter head being provided with a singleslot opening on the periphery thereof, and a cutting tool mounted insaid slot, said slotand tool being oblique to the cutter-head radiusthrough the outer end of said Aslot and tool and having the rear orinner end of said slot and tool ahead of said radius in the direction ofcutter-head rotaangularly rearward thereof; with respect toV vseatgrinding member.k

tapered cutter head, means for rotating said cutter' head, said cutterhead being provided direction of rotation.

1l. A device for facing automobile valve seats and the like, comprisinga stem adapted to enter into the guide for the valve stem,

, a body adaptedto be clamped in fixed axial position, said body'beingtapered inaccordance with the taper of the valve seat and adapted to beseated in contact therewith,

and a singley cutting edge arranged in the tapered face of said body anda member on said stem for ymanual turning of said valve Y 12. A valveseat reamer, comprising a cutter Vhead adapted to be seated in contactwith the valve seat, means for rotating said cutter head, and a cuttingtool adjustably mounted in saidfcutter head, said cutting tool being sodisposed that that end of its cutting edge lying nearest the axis ofsaid cutter head has an'angular advance over the other end 'of saidcutting .edge in the direction of rotation. p

13. A valvek seat reamer, comprising a cutter head adapted to be seated.in contact with the valve seat, means for rotating said cutter head,and a cutting tool mounted'in said cutter head, said cutting'tool beingVso disposed that that end of its cutting edge lying nearest the axisfofsaid cutter head has an angular advance over the other end of saidcutting edge `in the direction v`of rol tation. l

In vwitness whereof, I have hereunto set ymy hand at Indianapolis,Indiana.

ALBERT C. SAVIDGE.

